2-m Bathymetric ArcRaster Grid of National Oceanic and Atmospheric Administration (NOAA) Survey H11250 of Eastern Long Island Sound (H11250U, UTM, Zone 18)

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Frequently anticipated questions:

What does this data set describe?

Title:
2-m Bathymetric ArcRaster Grid of National Oceanic and Atmospheric Administration (NOAA) Survey H11250 of Eastern Long Island Sound (H11250U, UTM, Zone 18)
Abstract:
The U.S. Geological Survey, in cooperation with the National Oceanic and Atmospheric Administration and the Connecticut Department of Environmental Protection, has produced detailed geologic maps of the sea floor in Long Island Sound, a major East Coast estuary surrounded by the most densely populated region of the United States. These studies have built upon cooperative research with the State of Connecticut that was initiated in 1982. The current phase of this research program is directed toward studies of sea-floor sediment distribution, processes that control sediment distribution, nearshore environmental concerns, and the relation of benthic community structures to the sea-floor geology. Anthropogenic wastes, toxic chemicals, and changes in land-use patterns resulting from residential, commercial, and recreational development have stressed the environment of the Sound, causing degradation and potential loss of benthic habitats (Koppelman and others, 1976; Long Island Sound Study, 1994). Detailed maps of the sea floor are needed to help evaluate the extent of adverse impacts and to help manage resources wisely in the future. Therefore, in a continuing effort to better understand Long Island Sound, we have constructed and interpreted mulitbeam bathymetric data within specific areas of special interest. The gridded data presented herein covers a roughly 94 km square area of the sea floor in the area known as the Race at the eastern end of Long Island Sound. The original multibeam bathymetric data were collected during October 2003 as part of charting applications aboard the NOAA Survey Vessel Thomas Jefferson. A Simrad EM1002 multibeam system mounted on the hull of this vessel was used to acquire over 560 km of survey lines from the deeper water (>20 m) parts of the study area. Two 29-foot launches with hull-mounted Reson systems were deployed from the ship and were used to acquire an additional 637 km of survey lines from the shallower areas. The detailed bathymetic data and their interpretations serve many purposes, including: (1) defining the geological variability of the sea floor, which is one of the primary controls of benthic habitat diversity; (2) improving our understanding of the processes that control the distribution and transport of bottom sediments and the distribution of benthic habitats and associated infaunal community structures; and (3) providing a detailed framework for future research, monitoring, and management activities. The bathymetric data models also serve as base maps for subsequent sedimentological, geochemical, and biological observations, because precise information on environmental setting is important for selection of sampling sites and for accurate interpretation of point measurements.
  1. How might this data set be cited?
    U.S. Geological Survey, and National Oceanic and Atmospheric Administration, 2007, 2-m Bathymetric ArcRaster Grid of National Oceanic and Atmospheric Administration (NOAA) Survey H11250 of Eastern Long Island Sound (H11250U, UTM, Zone 18): Open-File Report 2007-1012, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Poppe, L.J., DiGiacomo-Cohen, M.L., Doran, E.F., Smith, S.M., Stewart, H.F., and Forfinski, N.A., 2007, Geologic Interpretation and Multibeam Bathymetry of the Sea Floor in the Vicinity of the Race, Eastern Long Island Sound: Open-File Report 2007-1012, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: 1 DVD-ROM
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -72.177678
    East_Bounding_Coordinate: -71.973646
    North_Bounding_Coordinate: 41.280964
    South_Bounding_Coordinate: 41.170882
  3. What does it look like?
    http://pubs.usgs.gov/of/2007/1012/data/bathy/grids/utm/h11250_utm18_bathy2m/h11250u.gif (GIF)
    Thumbnail map of the grid.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2003
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 5836 x 8364 x 1, type Grid Cell
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 18
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -75.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 2.000239
      Ordinates (y-coordinates) are specified to the nearest 2.000239
      Planar coordinates are specified in meters
      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Mean Lower Low Water
      Depth_Resolution: 9999
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
    • National Oceanic and Atmospheric Administration
  2. Who also contributed to the data set?
    Source data were acquired during National Oceanic and Atmospheric Administration (NOAA) survey H11250. Please acknowledge NOAA as the originator of the dataset from which this dataset was derived.
  3. To whom should users address questions about the data?
    Larry Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2314 (voice)
    508-457-2310 (FAX)
    lpoppe@usgs.gov

Why was the data set created?

The purpose of this datalayer is to release a 2-m grid of National Oceanic and Atmospheric Administration (NOAA) survey H11250 in UTM18 from easternmost Long Island Sound and westernmost Block Island Sound. This GIS layer serves a starting point for a geologic study of the area surrounding the Race Long Island Sound. It can be used as a base for the interpretative layers and images. This gridded data can be used in ArcMap or ArcView to dramatically display the varied bathymetry and geologic features of the area.

How was the data set created?

  1. From what previous works were the data drawn?
    B370_03_H11250G_dtm2m_interp.gutm (source 1 of 1)
    National Oceanic and Atmospheric Administration, Unpublished Material, B370_03_H11250G_dtm2m_interp.gutm.

    Type_of_Source_Media: DVD-ROM
    Source_Contribution:
    Digital terrain model with 2 m resolution in .gutm format created by National Oceanic and Atmospheric Administration (NOAA). This data format is used for viewing the model with GeoZui3D software.
  2. How were the data generated, processed, and modified?
    Date: 2003 (process 1 of 7)
    The multibeam bathymetric data presented herein were collected during October 2003 over a roughly 91 km2 area as part of charting applications aboard the NOAA Survey Vessel Thomas Jefferson. A Simrad EM1002 multibeam system mounted on the hull of this vessel was used to acquire over 560 km of survey lines from the deeper water (>20 m) parts of the study area. Two 29-foot launches with hull-mounted Reson systems were deployed from the ship and were used to acquire an additional 637 km of survey lines from the shallower areas. Horizontal resolution of the data varies with water depth, but averages 1-2 m. Vertical resolution is about 0.5% of the water depth. Person who carried out this activity:
    Shep Smith
    National Oceanic and Atmospheric Administration
    Field Operations Officer
    439 W. York Street
    Norfolk, VA
    USA

    (757) 441-6726 (voice)
    shep.smith@noaa.gov
    Data sources used in this process:
    • raw data
    Data sources produced in this process:
    • b370_h11250_dtm2m.gutm
    Date: 2004 (process 2 of 7)
    The .gutm file was converted to ASCIIgrid format. Person who carried out this activity:
    Chris Polloni
    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2280 (voice)
    cpolloni@usgs.gov
    Data sources used in this process:
    • b370_h11250_dtm2m.gutm
    Data sources produced in this process:
    • b370_03.asc
    Date: 2004 (process 3 of 7)
    The ASCII grid was converted to ArcGIS Raster GRID format, and then renamed. Person who carried out this activity:
    Mary DiGiacomo-Cohen
    U.S. Geological Survey
    Geologist / GIS Analyst
    Long Island Sound Resource Center
    Groton, CT

    (860) 405-9210 (voice)
    mdicohen@usgs.gov
    Data sources used in this process:
    • b370_03.asc
    Data sources produced in this process:
    • B370_03
    • h11250u
    Date: 13-Apr-2016 (process 4 of 7)
    Edits to the metadata were made to fix any errors that MP v 2.9.32 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). In the case of the depth resolution, the value of 9999 was entered to indicate that the original metadata did not contain the required information. The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 14-Feb-2017 (process 5 of 7)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
    Date: 18-Nov-2019 (process 6 of 7)
    Crossref DOI link was added as the first link in the metadata. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 08-Sep-2020 (process 7 of 7)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Poppe, L.J., DiGiacomo-Cohen, M.L., Smith, S.M., Stewart, H.F., and Forfinski, N.A., 2006, Seafloor character and sedimentary processes in eastern Long Island Sound and Western Block Island Sound: Geo-Marine Letters v. 26, p. 59-68.

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    The only attribute value represents gridded bathymetry measured in meters; accuracy of the multibeam system is depth dependent.
  2. How accurate are the geographic locations?
    Navigation was by differential GPS; positional accuracy to less than 10 m.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    All collected data were processed and used to generate the gridded data. The area is considered complete; the gaps in the data lie in areas inaccessible to the survey vessels (shallow water surrounding islands).
  5. How consistent are the relationships among the observations, including topology?
    Information unavailable from original metadata.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
Data are not to be used for navigation purposes. Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) and the Connecticut Department of Environmental Protection as the originators of this dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Attn: Larry Poppe
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2314 (voice)
    508-457-2310 (FAX)
    lpoppe@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data - H11250U - ArcGIS grid format bathymetry layer
  3. What legal disclaimers am I supposed to read?
    Although this data set has been used by the U.S. Geological Survey (USGS), National Oceanic and Atmospheric Administration (NOAA), and the Connecticut Department of Environmental Protection (CTDEP), no warranty, expressed or implied, is made by the USGS, NOAA, and the Connecticut DEP as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by these agencies in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The user must have a program similar to ArcGIS that is capable of reading and processing the data files.

Who wrote the metadata?

Dates:
Last modified: 16-Nov-2021
Metadata author:
U.S. Geological Survey
Attn: Larry Poppe
Geologist
384 Woods Hole Road
Woods Hole, MA
USA

508-548-8700 x2314 (voice)
508-457-2310 (FAX)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS or the email is otherwise invalid.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2007-1012/h11250u.arcg.faq.html>
Generated by mp version 2.9.50 on Tue Nov 16 10:06:33 2021